Marvel getting desperate

On a recent episode of Pardon the Interruption Tony Kornheiser had a line I thought was interesting

He was talking about sports dynasties in general and the Golden State Warriors in particular

"First you're good. Then you're great. Then you're good. Then you're done."

That may apply to Marvel. Maybe it's just over.

And if it is, the MCU will still go down as one of Hollywood's greatest successes

And improbable. After seeing Iron Man for the first time and finding out about their plan for a shared universe of movies, I thought "that will never work"

It did. For well over a decade

I think they need to start over

Instead of incorporating the X-Men and Fantastic Four into this existing MCU start a new one over with them then introduce new versions of Spiderman, Hulk, Captain America etc. and not just re cast version of the same heroes, but complete new versions. Make it clear this is not the same Iron Man and Thor we've seen

And even then, it may not be enough. Maybe comic book movies are just done for now. they'll be back, the characters are too ingrained in our culture not to be but maybe not for a decade.

I'm very curious what the new Superman turns out to be
I also think a break and a full reboot would do good.
Remember that gap between Batman & Robin and Batman Begins?
That created anticipation.
Like you said, the characters will still be there.